Abstract
Twin-screw compressors are widely used in aerodynamics, refrigeration and other fields. The screw rotors are the core component of the screw compressor and affect the performance of the compressor. This paper focuses on variable-lead rotors. A thermal process simulation model considering leakage is established to calculate the efficiency of the compressor. Different lead change methods are compared by evaluating the contact line, exhaust port and simulation results. The results show that the compressor obtains better performance when the lead decreases rapidly on the discharge side. Furthermore, the effects of the wrap angle and internal volume ratio on variable-lead rotors are studied. The work provides a reference for the design of the screw compressor rotor.
Highlights
The twin screw compressor is a rotary positive displacement machine used to compress gases to higher pressure
The volumetric efficiency ηV is ηV = qV /qVt, where qV is the actual volume flow of the compressor converted from the actual discharge flow to the suction state, and qVt is the sum of the volume between the teeth rotated by the rotor in unit time
The parameter Li was proposed to measure the intensity of variable lead, using mathematical models to simulate the working process and analyzing the per
Summary
The twin screw compressor is a rotary positive displacement machine used to compress gases to higher pressure. It has two parallel helical rotors, usually called the male and female, which mesh with each other. The compression chambers are enclosed by the helical surfaces of the meshing rotors and the inside surface of the case. During the rotation of the rotors, the volume of the working cavity periodically increases from zero to its maximum value and decreases to zero, making suction, compression and discharge processes possible and achieving the goal of increasing the gas pressure. Twin screw compressors are deployed in many industries that require high performance, low noise and high efficiency [1]. The optimization design of the rotor has always been the focus of research on screw compressors
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